diff --git a/Documentation/Developers/REGISTER b/Documentation/Developers/REGISTER
index 3ba030c72..124018c1f 100644
--- a/Documentation/Developers/REGISTER
+++ b/Documentation/Developers/REGISTER
@@ -48,6 +48,9 @@ Reserved User and Group IDs:
   - exim users:		- exim groups:
       exim   30		   exim     30
 
+  - ivman user:     - ivman group:
+      ivman  32        ivman    32
+
   - nullmailer users:   - nullmailer groups:
       nullmailer 38        nullmailer 38